Composition for polishing celluloid surfaces



Patented June '22, 1926.

UNITED STATES 1,589,813 PATENT OFFICE.

m'rmw name-m. :uo'onn, or covnn'rmr, ENGLAND.

CO HYOSITION FOB POLISHING GELLULOID SURFACES.

Re Drawing. Application filed June 18, 1925. Serial No. 88,108, and in Great Britain Kay 27, 1924.

' This invention has for its object to pro-' vide a simple process for producing a ill h- 4k finish is class finish on celluloid or surfaces which have been coated with a celluloid solution, celluloid varnish, or other suitable celluloid preparation.

According to this invention, -the surface is rubbed down, and friction-polished, with a composition comprising a suitable solvent of celluloid and a very fine cutting, levelling, and polishing grit, to which is added a lubricant, whereby the surface is levelled without appreciably adding to nor removing from the material forming the surface.

I prefer to employ either methylated spirits or turpentine, or both, in equal parts, as the solvent, and Vienna chalk for the fine cutting, levelling and polishinggrit.

For the lubricant, other suitable oil, or 0th, may be used.

Itis an essential feature of the invention that during the polishing process nothing is. added to nor appreciably removed from the existi surface. Any rou hness of the latter' is eliminated by a leveling action which transfers the crests of such roughness into the depressions thereof so that they are filled and the surface is thereby made smooth.

In the preferred method of carryin out this invention, a. composition is employed co risin equal parts .in bulk of methylate spirits and turpentine, and a quarter of the bulk of that mixture in Vienna chalk, with a lubricant. These are mixed together and applied to a ra cotton wool, rubber, bob. or the like; wit which the surface is then polished. The polishing is carried out so as to rub down the surface and polish it, and therefore it is done comparatively quickly and forcibly, as in ordinary polishing. his smoothens the surface, which dries rapidly.

In many cases the resultant finish is all that is desired, but, where a very high class uired a further com osition isused comprising four arts each y bulk of the solvent and of the e cutting and polishing grit, and one part by bulk of linseed oil or araflin. In making this composition,

.pre erably turpentine, methylated spirits,

and linseed oil or paraffin oil, are mixed together. The Vienna chalk is made into a paste separately with methylated s irits to about the consistency of cream, an is then added. The mixture is then agplied to a rag, cotton wool, rubber, bob or t e like, and

arafiin oil, linseed ortions, such as celluloid tions may be varied, and the specific i11.

gredients changed for others having equivalent effects, the essential feature being that the process involves friction polishing by the aid of a suitable solvent of the celluloid in conjunction with a fine cutting, levelling, and polishing grit. Generally, the solvent must be of a mild nature such as those specified, acetone being, in most cases, too active. 7

The process can be used for celluloid coatings on wood of coarse grain, provided that the grain has been sufficiently filled before being sprayed with celluloid. It can also be used for celluloid coating upon metal, and the metal may have been tinted or coloured before bein coated with celluloid and before the su sequent polishing process. In some circumstances it can also be used upon celluloid sheets. It can also be used on surfaces coated with coloured celluloid pre araaints or ename s.

It is essential to ad some linseed oil or arafi'm to the composition to act as a ubricant and reduce the effect of the solvent on the surface.

An additional advantage arising out of the invention is that a. surface once polished by this process can, when scratched or damaged, have its surface made ood by a further polishing process embo ying the celluloid solvent and fine grit',.with a lubricant.

What I claim as my invention and desire to secure by Letters Patent of the United States is l 1. A composition for polishing celluloid surfaces consisting of four parts of a celluloid solvent, four parts of grit, and one part of lubricant, all by volume.

2. A composition" for polishing celluloid surfaces consisting of two parts" of methylated spirits, two parts of spirits of turpentine, four arts of Vienna chalk, and one part linsee oil, all by volume. y

In testimony whereof I have signed my name to this s ecification.

I MA w BARRATT MOORE- 

